bsp: Update Corstone-1000 firmware settings

Since K3s is not supported and can be included from k3s.yml maintained in meta-cassini. The firmware configuration doesn't need to explicitly remove it.

Even if k3s.yml is forced to be built with Corstone-1000, the K3s feature will still be removed, which is defined in corstone1000-mps3.yml on meta-cassini.

Signed-off-by: Vikas Katariya vikas.katariya@arm.com